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No. 6l8,679. Patented Jan. 31,1899;

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(Application 8101 my 90, 1898.)

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No. 618,679. Patented Jan. 3:, I899. v. E. HUNTER.

AUTOMATIC STOPPING MECHANISM FOR ENGINES.

' (Application and m 20, 1898.) (No Model.) 2 Shaets-Sheet 2.

Snow Won @emcw m: ucnms Pzrzns co, PnoTo uma, WASHINGTON, nv c UNITED STATES PATENT OFFICE.

VIO"OR E. nnnrnn, or OLEBURNE, TEXAS, AssIenon or ONE-HALF To JACOB D. omens, or SAME PLACE.

AUTOMATIC STOPPING MECHANISM FOR ENGINES.

SPECIFICATION forming part of Letters Patent No. 618,679, dated January 31, 1899.

Application filed May 20, 1898. Serial No. 681,246. (No model.)

To aZZ whom, it may concern:

Be it known that I, VICTOR E. HUNTER, a citizen of the United States, residing at Oleburno, in the county of Johnson and State of Texas, have invented certain new and useful Improvements in Automatic Stopping Mechanism for Engines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to automatic stopping mechanism for engines, the object being to provide means in connection with a rotary shaft whereby the supply of steam to the engine may be out off in the event of the rotation of the shaft becoming too rapid.

The present invention is in the nature of an adaptation of the electrical-circnit-making apparatus illustrated and described in my former patent, dated January 11, 1898, No. 597,198, to a rotary shaft.

The detailed objects and advantages of the invention will be fully set forth in the ensuing description.

The invention consists in certain novel features and details of construction and relative disposition of parts, as hereinafter particularly set forth, illustrated in the drawings,

on, the same being shown in proper proximity to the circuit-making apparatus. Fig. 2 is a detail perspective view showing the circuitmaking apparatus, including the trip mechanism. Fig. 3 is also a perspective view showing the electromagnet, armature, and a portion of the throttle-valve, including the means for releasing the valve-closing mechanism.

Similar numerals of reference designate corresponding parts in all the views.

Referring to the drawings, 1 designates a rotary shaft, upon which, in carrying out the present invention, is mounted a pulley embodying a rim 2. If desired, the rim need not be continuous, but a segment or a section of a rim may be employed.

Extending radially outward from the rim 2 is a fulcrum-post 3, the inner end of which is threaded and inserted through the threaded opening in the rim, thereby making the post adjustable, so that its outer end may be brought nearer to or farther from the rim of the pulley. lVhen adjusted and made the proper length, the post is held by a lock-nut l. Pivotally connected to the outer end of the post 3 is a centrifugal arm 5, curved to make the same norm-ally concentric with the shaft 1. The end of the arm 5 opposite the end which is pivoted is left free in order that it may be thrown out by centrifugal action when the rotation of the shaft becomes very rapid.

Extending radially outward from the rim 2 is a limiting-guide 6 in the form of a post,

the inner end of which is threaded and inserted in a threaded opening in the rim, thereby rendering the said guide adjustable longitudinally. W'hen adjusted, it is held fixed by means of a lock-nut 8, which bears against the outer surface of the rim. The guide 6 is provided in its outer end with an inclosed longitudinal slot 7 through which the arm 5 passes, the inner end of said slot serving as a means for limiting the inward movement of the arm and the outer Wall of the slot serving as a means for limiting the outward movement of said arm. The slot is of a width equal to or slightly greater than the width of the arm 5, and thus the arm 5 is also steadied and braced laterally, so that its only move ment can be inward and outward toward and away from the shaft 1.

Interposed between the rim 2 and the arm 5 is a spiral retracting-spring 9, the inner end of which is attached to a hook or eye 10, having a swiveled connection with a screw or nipple ll, threaded into the rim 2 and made adjustable, whereby the tension of the spring maybe increased or diminished. The spring is attached at its outer end to a perforated car 12 on the inner side of the centrifugal arm 5. It will thus be apparent that as the speed of the shaft 1 increases the arm 5 will be moved outward by centrifugal action, overcoming the tension of the spring 9, and as the free end of the arm 5 moves outward it will come in contact with the trip of the circuit-malcing apparatus hereinafter described and designed to shutoff the steam by operating the throttle-valve of the engine.

The electrical circuit making apparatus comprises a support 13, which is preferably tubular, being in the form of an upright pipe, and mounted upon this support is a bracket 11-, consisting of opposing plates or members 15, bent to embrace the support 13 and adapted to be clamped thereon by means of transverse bolts or other suitable fasteners 16. One of the members 15 is provided with a spacinglug] 7 to gage the distance between said members, and at their outer ends the members are provided with oppositely-located and outwardly-projeeting offsets 18, forming a hemispheroidal cavity or socket 19, in which is received the ball-head of a vibratory arm 21.

22 designates a tension bolt or screw for adjusting the frictional bearing of the members 15 upon the arm 21, so as to hold said arm with a certain amount of resistance in any desired position.

Connected pivotally to the upper end of the arm 21 is a trip 23, having a laterally-projecting arm it, to which is connected one end of a coil-spring 25, the opposite end of which connects to a fixed point on the arm 21, located at one side of the pivot 26, so that when the trip 33 is moved in either direction it will be held in such position by means of the spring 25. Connected to the arm 21 is a bindingpost 27, to which one of the line-wires 28 is connected. Connected to the opposite side of the arm 21, which is of some non-condueting material, such as wood, is a second binding-post 29 to which the remaining line or circuit wire is secured. Extending awayfrom the bindingpost 39 and in electrical connection therewith is an arm 31, the upper end 82 of which is arranged in the path of the trip 23, so that when said trip is thrown against the arm 31 an electrical circuit will be completed through the wires 28 and 30, bindingposts 97 and 2., spring 25, arm 24, trip 23, and arm 31. The circuit-wires 28 and extend downward through the pipe 13 and through the floor 13-3 into another compartment, where the engine is arranged.

3t designates a portion of the valve-easing or steam-chest of the engine, and 35 the valvestem, which is rotatable and provided with a disk or wheel 30, having one or more openings 37. Secured to the part 3% is an arm or bracket of sufficient length to support an electromagnet 39. The armature of the magnet carries a slide-rod 41, the extremity of which is adapted to enter in one of the openings 37 in the disk or wheel 36. The rod l1 is extended to slide through a guide-opening 2 in the yoke 43 of the electromagnet 39, said rod also extending through an additional guide or bearing l-t on the outer end of the arm 38.

-.t5 designates a spring for moving the sliderod -11 into engagement with the wheel or disk 36, said spring being interposed between the armature and a fixed point on the arm 38. The wheel or disk 30 has a grooved rim and constitutes a drum, upon which is wound a cord or other flexible device 4C6, having at its end a weight 1-7 of sufficient size to rotate the valve-stem and close the throttle-valve.

I11 operation the centrifugal arm when thrown out by the rapid rotation of the shaft comes in contact with the trip 23. This moves into contact with the arm t1 and closes the circuit. The effect of this is to attract the armature l0, and thereby withdraw the rod 1-1 from engagement with the wheel This allows the wheel to rotate under the in fluence of the weight 47, thereby closing the throttlevalve and stopping the engine. The same result would follow in the event of the pulley itself becoming loose and shifting.

It will of course be understood that the device is susceptible of changes in the form, proportion, and minor details of construction, which may accordingly be resorted to without departing from the principle or sacrificing any of the advantages of the invention.

Having thus described the invention,what is claimed as new, and desired to be secured by Letters Patent, is-

1. The combination with a rotary shaft, of a wheel or pulley mounted thoreon,a fulcrumpost extending radially outward from the rim thereof, a guide-post also extending radially outward from the rim and provided with a longitudinal slot terminating in an end crosspiece, a curved centrifugal arm pivotallyconnected at one end to the fulcrum-post and passing at an intermediate point through the slot in the guide and limited in its outward. movement by said cross-piece, and a spiral spring interposed between the centrifugal arm and the rim of the wheel or pulley for normally holding said arm inward, substantially as described.

2. The combination with a rotary shaft, of V a wheel or pulley fast thereon, a fulcrum-post extending radially outward from the rim and made adjustable in length, a limiting-guide extending radially outward from the wheel or pulley and also made adjustable longitudinally and further provided with a longitudinal slot terminating in an end cross-piece, a curved centrifugal arm pivotally connected at one end to said fulcrum-post and passing at an intermediate point through the slot in the guide and limited in both its inward and outward movements thereby, and a spiral retracting-spring connecting the centrifugalarm with the rim of the wheel or pulley and having provision whereby its tension may be regulated, substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

VICTOR E. HUNTER. Vitnesses:

R. G. HALL, J. D. OLIGER. 

